| 35Rich | -- 03-27-2012 @ 4:32 PM |
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Does anyone have experience with Pennzoil Synchromesh Manual Transmission Fluid in old Ford 3 speed gearboxes? My brother says it works great in his 65 Corvair.
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| TomO | -- 03-28-2012 @ 7:34 AM |
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Pennzoil says that this oil was specifically designed to work in GM and Chrysler trans-axles. It does not give a viscosity number. The early Ford transmissions work better with a heavier gear oil such as 95W / 140. Tom
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| 51f1 | -- 03-28-2012 @ 1:10 PM |
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GM uses synthetic 5W-30 in their manual transmissions. Don't put that in your old Ford manual. The old transmissions I am familiar with originally used 90 weight oil in the winter and 140 weight oil in the summer. Today multi-weight oils are available such as 75W-140. I have used that since I rebuilt my transmission, mainly because that's what they have at Walmart. Even though it's synthetic, leakage is non-existent. And it's bound to be far superior to what was available when my truck was new in 1951. Richard
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| supereal | -- 03-29-2012 @ 10:51 AM |
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Good advice, Richard. Old Ford transmissions usually leak somewhere, such as at the front or rear shafts, or around the shift levers, if a side shifter. Henry didn't place much stock in seals, preferring slingers. If the transmission is overfilled, the excess will travel down the torque tube the oil level should be kept just below the bottom edge of the filler hole. I use 140 year around. The heavier lube helps shifting by slowing down the gears between shifts, as well as less leaking.
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